扩展Magento API-路径无效

我正在尝试扩展Magento API-我遵循了大多数教程中的步骤，并完成了以下操作。当我尝试调用任何扩展的api方法时，我总是从品红色中得到一个无效的资源路径错误。

在app/etc/modules中创建一个名为Woe_Services.XML 的模块XML描述符

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Woe_Services>
            <active>true</active>
            <codePool>local</codePool>
        </Woe_Services>
    </modules>
</config>

我创建了一个相应的目录结构：

-app
--code
---local
----Woe
-----Services
------etc
-------|api.xml
-------|config.xml
------Model
------- Catalog
-------- Product
--------- Attribute
---------- Api.php

我的config.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Woe_Services>
            <version>1.0</version>
        </Woe_Services>
    </modules>
    <global>
        <models>
            <catalog>
                <rewrite>
                    <product_attribute_api>Woe_Services_Model_Catalog_Product_Attribute_Api</product_attribute_api>
                </rewrite>
            </catalog>
        </models>
    </global>
</config>

我的api.xml文件如下：

<?xml version="1.0"?>
<config>
    <api>
        <resources>
            <catalog_product_attribute translate="title"
                module="catalog">
                <title>Product attributes API</title>
                <model>catalog/product_attribute_api</model>
                <acl>catalog/product</acl>
                <methods>
                    <create translate="title" module="catalog">
                        <title>Create new product attribute</title>
                        <acl>catalog/product/attribute/create</acl>
                    </create>
                    <delete translate="title" module="catalog">
                        <title>Delete product attribute</title>
                        <acl>catalog/product/attribute/delete</acl>
                    </delete>
                    <addoptions translate="title" module="catalog">
                        <title>Add attribute options</title>
                        <acl>catalog/product/attribute/addoptions</acl>
                    </addoptions>
                </methods>
            </catalog_product_attribute>
        </resources>
        <acl>
            <resources>
            </resources>
        </acl>
    </api>
</config>

最后，Api.php文件如下：

<?php
/**
 * @category    Ajzele
 * @package     Ajzele_Mapy
 * @copyright   Copyright (c) Branko Ajzele (http://activecodeline.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
/**
 * Catalog product attribute api
 *
 * @category   Ajzele
 * @package    Ajzele_Mapy
 * @author     Branko Ajzele <ajzele@gmail.com>
 */
class Woe_Services_Model_Catalog_Product_Attribute_Api extends Mage_Catalog_Model_Product_Attribute_Api
{
  /**
     * Create new product attribute.
     *
     * @param string $attributeName
     * @param array $attributeData
     * @param string|int $store
     * @return int
     */
    public function create($attributeName, $attributeData, $store = null)
    {
    // create product attribute
        $installer = new Mage_Catalog_Model_Resource_Eav_Mysql4_Setup('core_setup');
        $installer->addAttribute('catalog_product', $attributeName, $attributeData);
    // get product attribute id
        $storeId = $this->_getStoreId($store);
        $attribute = Mage::getModel('catalog/product')
            ->setStoreId($storeId)
            ->getResource()
            ->getAttribute($attributeName);
    return $attribute->getId();
    }
   /**
     * Create attribute options
     *
     * @param string $attributeId
     * @param array $attributeOptions
     * @return int
     */
    public function addoptions($attributeId, $attributeOptions)
    {
    $setup = new Mage_Eav_Model_Entity_Setup('core_setup');
    for($i = 0; $i < sizeof($attributeOptions); $i++) {
        $option = array();
        $option['attribute_id'] = $attributeId;
        $option['value'][$value][0] = $attributeOptions[$i];
        $setup->addAttributeOption($option);
    }
    return true;
    }
   /**
     * Delete product attribute.
     *
     * @param string $attributeName
     * @param string|int $store
     * @return int
     */
    public function delete($attributeName, $store = null)
    {
        $storeId = $this->_getStoreId($store);
        $attribute = Mage::getModel('catalog/product')
            ->setStoreId($storeId)
            ->getResource()
            ->getAttribute($attributeName);
        if (!$attribute) {
            $this->_fault('not_exists');
        }
        try {
            $attribute->delete();
        } catch (Mage_Core_Exception $e) {
            $this->_fault('not_deleted', $e->getMessage());
            return false;
        }
    return true;
    }
}